Locomotive boiler



July 11, 1944. B. E. LARSON LOCOMOTIVE BOILER Filed 'April '7, 1941 Barf WK L arson fl/ma (m shell.

Patented July 11, 1944 LOCOMOTIVE BOILER.

Bert E. Larson, Park Ridge, 111., assignor to Locomotive Firebox Company, Chicago, Ill., a corporation of Delaware Application April 7, 1941, Serial No. 387,255

2 Claims.

This invention relates to improvements in locomotive boilers and it consists of the matters hereinatter described and more particularly pointed out in the appended claims. The invention is more especially concerned with the construction in a locomotive boiler having a firebox equipped with a watersteaming and circulating element that requires an elongated opening in the crown sheet for its installation. As an example of an element of this kind, mention is mad or the well-known thermic syphons. Such an element includes a fiat hollow staybolted body having an elongated and usually flanged top end discharge or outlet adapted to be secured in an elongated opening in the crown sheet and at least one tubular inlet neck adapted to be secured in an opening in another sheet of the firebox, below the crown sheet.

In the conventional type of locomotive boiler, crown staybolts are employed between the crown sheet of the firebox and that part of the wrapper or root sheet thereabove and these bolts are generally much longer than the conventional staybolts employed between the side sheets of the firebox and the outer side sheets of the boiler The top flange for the body has a width that is equal to the spacing between i'our'transin making such an elongated opening in the firebox is to dispose the center line thereof in line with one longitudinal row of crown staybolts within the area of said flange. The staybolts in this center row, as well as those in the rows at each side thereof, within the area of said opening, are then removed. When the syphon flange is disposed in the opening, the crown staybolts in the side rows in said area are replaced to again connect said flange to the wrapper or root sheet. Heretofore no crown s'taybolts were employed or substituted for those removed from above the outlet opening of the syphon. This transferred the load to the crown staybolts connecting the flanges and the wrapper sheet and therefore in the replacement of such bolts, bolts of larger diameter were employed. The removal and omission of the center line of bolts also induces an additional load upon that area of the wrapper sheet above the syphon flange and between the side rows of bolts.

in which is located a firebox ll.

One of the objects of the invention is to provide a simple and eilicient means for providing a connection between the outlet opening of the syphon and that part of the wrapper sheet thereabove and whereby said part of the wrapper sheet is better able to withstand internal boiler pressures.

A further object of the invention is to provide means for this purpose which includes a plurality of pivotal connections having axes disposed in a plane other than parallel with said means as a whole, whereby a limited lateral flexibility is present to accommodate some relative lateral movement between said part or the wrapper sheet and associated part of the crownsheet.

The above mentioned objects of the invention as well as others, together with the advantages thereof will more fully appear as the specification proceeds.

In the drawing:

Fig. 1 is a longitudinal vertical sectional view through the firebox end of a locomotive boiler embodying one form of the invention.

Fig. 2 is a transverse vertical detail sectional view through a part of the boiler and adjacent crown sheet part of the firebox on an enlarged scale as taken on the line 2-2 of Fig. l.

Fig. 3 is a vertical detail sectional view as taken on the line 3-3 of Fig. 2.

Referring now in detail to that embodiment of the invention illustrated in Figs. 1, 2 and 3 of the drawing, l0 indicatesas a whole the rear end part of the barrel or shell of a locomotive boiler and The firebox includes'a crown sheet I 2 which extends from the fiue sheet l3 to the back sheet ll of the firebox and whichcrown sheet merges at its sides into the side sheets I! of the firebox, only one of which appears in Fig. 1., The bottom end part of the flue sheet merges into the front throat sheet l6.

l1 indicates that part of the wrapper or roof sheet of the boiler above the crown sheet, It! indicates the back sheet thereof and I9 indicates the outer front throat sheet. So-called crown staybolts 20 extend between and operatively connect the wrapper or root sheet pant I1 and the crown sheet. These bolts are disposed in rows extending longitudinally and transversely of the firebox.

The wrapper or roof sheet part I! merges at its sides into the outside wrapper sheets (not shown) that are stayed to and cooperate with the side sheets I! of the firebox to form the usual side water legs. The sheets l4 and it which are also staybolted together cooperate in forming the back water leg 2! and the inner and outer throat sheets I6 and I9 which are also staybolted together, cooperate in forming the front water leg 22. All of said water legs are bottomed by a mud ring 23.

24 indicates as a whole, a water steaming and circulating element in the firebox and which element in this instance is illustrated as one of the well-known thermic syphons. Such a syphon comprises a fiat hollow body disposed in an upright position in the firebox and generally extends longitudinally of the firebox.

The body of the syphon includes spaced side walls 25-25 and front and rear end walls 26 and 26a respectively. The side walls are connected together by longitudinal rows of staybolts 25a. The top end of the side walls and the front and rear end walls are formed as a laterally extending flange 21 that extends entirely about the top end of the body and said side walls are connected to said flange by a rounded comer 28 arranged in a plane above the topmost row of staybolts 25a. The flange mentioned defines the discharge or outlet of the syphon and through which water passes from the body of the syphon into the steam and water space of the boiler above the crown sheet.

The bottom of said body is closed by a bulged portion 29 that extends in a downward and forward direction in the firebox and terminates in a tubular inlet neck 29a that opens through the inside throat sheet l8 of the firebox so as to take in or receive boiler water from the front throat.

When only one of the syphons described is to be installed in a firebox, an elongated opening 28a. is formed longitudinally in the firebox crown sheet of a shape and area corresponding to that of the syphon flange 21. When more than one syphon is to be installed in the firebox, usually a separate opening is made for each one of said syphons. In Fig. 2 only the sides of .such openings are shown.

As before pointed out, the opening 28a is of a width substantially the same as the spacing'between the centers of the crown staybolts 20 in four laterally spaced rows thereof. In producing said opening, its center line is disposed in the longitudinal plane of the center row of crown staybolts 2B in the crown sheet. Thus owing to the width of said flange 21, three rows of crown staybolts 20 are removed from the crown sheet within the area of said opening and this disposes the edge of said opening midway between adjacent rows of crown staybolts and disposes the planes of the rows of such bolts on each side of saidcenter row about midway between the edges 7 of the side portions of the flange.

In applying certain ones of the staybolts 25a in the top row thereof in the syphon body, near the flange 21, I pass certain ones through the sleeve 30 of a link member 3| that is positioned in the outlet opening of the syphon body. Theand the bottom extremity thereof may be upset as at 35 to hold this end of the bolt in place,

in the clevis.

The top end of said bolt-like rod 34 is made to have a so-called universal joint connection 30 with the wrapper or root sheet. Said universal joint connection is not described in detail herein as its construction is well known. Instead of the universal joint connection mentioned, one of the so-called rigid type may be employed.

In installing the syphon, it will have attach thereto the link members 3|, the clevises 32 and the bolt members 34, the connection for the top end of said bolt members with the wrapper sheet being made from outside of the wrapper sheet. Also in the installation of the syphons, a row of staybolts 31 is employed to connect each to the wrapper sheet.

It is apparent that by means of the construction described, the top end of the syphon is connected to that part, of the wrapper sheet ll thereabcve so as to provide a mutuality of support. Therefore this part 01' the wrapper sheet is braced from the syphon against internal boiler pressure. Also the top end of the syphon is braced against depression and lateral spreading due to said pressure. By reason of the provision of the pivotal connections mentioned, the crown sheet may have a relative lateral movement with respect to the wrapper sheet within practical limits.

While in describing the invention, I have referred in detail to the form, construction and arrangement of the parts involved, the same is to be considered only in the illustrative sense so that I do not wish to be limited thereto except as may be specifically set forth in the appended claims.

I claim as my invention:

1. A locomotive boiler embodying therein a wrapper sheet, a firebox in said boiler including a crown sheet spaced below said wrapper sheet, a hollow water steaming and circulating element in the firebox having an end opening through the crown sheet so as to discharge water into the boiler space above the crown sheet, staybolts connecting opposed portions of said end of said element, a member having a connection with one of said bolts and extending upwardly therefrom, a clevis-like member having a pivotal connection with the first mentioned member, and means operatively connecting said clevis member with said wrapper sheet.

2. A locomotive boiler embodying therein a wrapper sheet, a firebox in said boiler including a crown sheet spaced below said wrapper sheet, a thermic syphon in the firebox having an em opening through the crown sheet so as to dis chargewater into the boiler spaced above the crown sheet, means extending between opposed portions of said end of said element, a link member connected to said means and extending up wardly therefrom, a bolt member depending from said wrapper sheet toward the crown sheet and having a clevis at its lower end and a pivot pin connecting the link member with theclevis, the pivot pin extending transversely of the thermic syphon whereby limited longitudinal and vertical movements between the syphon and the wrapper sheet are permitted.

BERT E. LARSON. 

